1
Abstract—The design of a wireless data link system capable of
transmitting and receiving 1 Gpbs data with a Bit Error Rate
(BER) better than 1E-6 is presented. The system was designed in
60 GHz ISM band. The spectrum between 57-64 GHz provides a
continuous block of 7GHz bandwidth, which provides a scope for
very large data rates in this band.
Index Terms—60GHz wireless transmission, 1Gbps data rate,
Bit Error Rate (BER), QPSK, Time Division Duplex (TDD).
I. I
NTRODUCTION
ITH the emergence of high speed wire-line networks,
such as Gigabit Ethernet, there’s also a need for a high
speed wireless counterpart. Such a high speed data link
wireless network can be used as a Personal Area Network, to
connect all the electronic devices of a user that can be used to
transfer high data rates within short distances of up to a few
meters.
II. WHY
60
GH
Z
?
The millimeter-wave portion of the RF spectrum (24 GHz
and 60 GHz ISM bands) has been largely unexploited for
commercial wireless applications and allows for large
bandwidth applications. In this band, the signal delay spread is
smaller compared to low frequency bands such as 2.4 GHz and
5 GHz. Also, the design of the system at 60 GHz ISM band
can easily meet the 1 Gbps requirement. In addition to the
high-data rates that can be accomplished in this spectrum,
energy propagation in the 60 GHz band has unique
characteristics that make possible many other benefits such as
excellent immunity to co-channel interference, high security,
and frequency re-use.
Point-to-point wireless systems operating at 60 GHz have
been used for many years for satellite-to-satellite
communications. This is because of high oxygen absorption
(Figure 1) at 60 GHz (10-15 dB/Km). This absorption
attenuates 60 GHz signals over distance, so that signals cannot
travel far beyond their intended recipient. For this reason, 60
GHz is an excellent choice for covert communications.
Another consequence of O
2
absorption is that radiation from
one particular 60 GHz radio link is quickly reduced to a level
that will not interfere with other 60 GHz links operating in the
same geographic vicinity. This reduction enables higher
"frequency reuse" - the ability for more 60 GHz links to
operate in the same geographic area than links with longer
ranges.
Figure 1: Oxygen Attenuation vs. Frequency
At higher frequencies antenna directivity is limited by the
physical principle of diffraction that states that the beam width
is inversely proportional to the operating frequency. Therefore
at 60 GHz, the beam width is far narrower than at the lower
frequency unlicensed bands.
The combined effects of O
2
absorption and narrow beam
spread result in high security, low interference and short
distance communication for 60 GHz links, which are the
desired characteristics for our communication system.
III. SYSTEM
PLANNING
Table 1 gives the specifications of the proposed wireless
system.
Table 1: Specifications of the proposed wireless system
Frequency Range
60.75-61.25GHz
Channel Spacing
500 MHz
Bandwidth
500 MHz
Duplex
TDD
Modulation
QPSK
Data Rate
1 Gbps
Max Transmitter Power
500 mW
Antenna
Dipole Antenna
Table 2 shows the frequency planning summary and Figure
2 illustrates the frequency planning spectrum.
1 Gbps Wireless Data link System at 60 GHz
Chandni Singh, Deepak Bhatia, Madhur Mehta , Pawan Sabharwal
W
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